You see a completed section, here, notice the repeating pattern, you spot a groove on every 4th bar...

Then I went and made a Proof-of-Concept Video, it's a makeshift thing, so you can and will make something a lot better-looking, notice, the underside has all the strenght, so it's turned up, so the magnets repel each other, lifting the "monorail train", a simple plastic U-shaped thing, with additional flaps to grab the track: